In this study, a series of octyl-modified alginates (H-SA) were successfully synthesized via covalently coupling various amounts of octylamine (OA) to sodium alginate (SA) and was then characterized by multiple techniques. Despite its poor surface tension reduction effectiveness, the synthesized H-SA could effectively reduce the oil-water interfacial tension. Therefore, the H-SA was used to emulsify various types of oils, and their emulsification performances were evaluated in terms of the oil droplet size and emulsion viscosity after emulsification. It was found that the emulsifying efficiency was enhanced with increasing octyl substitution degree (OSD) over the studied range. Moreover, the influences of pH value and salt content on the emulsifying efficiency were also investigated in detail. Overall, H-SA can be easily synthesized, providing a promising biodegradable emulsifier for the oil emulsification in an aqueous environment. Graphical abstract Graphical abstract

中文翻译：

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用于油水乳化的辛基改性海藻酸盐的简便合成

在这项研究中，通过将不同数量的辛胺 (OA) 与海藻酸钠 (SA) 共价偶联，成功合成了一系列辛基改性海藻酸盐 (H-SA)，然后通过多种技术对其进行了表征。尽管表面张力降低效果较差，但合成的 H-SA 可以有效降低油水界面张力。因此，H-SA被用于乳化各种类型的油，并根据乳化后的油滴大小和乳液粘度来评价它们的乳化性能。结果表明，在研究范围内，随着辛基取代度 (OSD) 的增加，乳化效率提高。此外，还详细研究了pH值和盐含量对乳化效率的影响。总的来说，H-SA 很容易合成，为水性环境中的油乳化提供了一种有前途的可生物降解乳化剂。图形摘要图形摘要